Metal working press



Feb. 23, 1932. RQDE ET AL 1,846,439

METAL WORKING PRESS Filed Dec. 26. 1950 3 SheetsP-Sheet 1 rm .Zzi.

| I .17 .ZQ i l 76 l Feb. 23, 1932. J, RQDE ET AL 1,846,439

METAL WORKING PRES S Filed Dec. 26. 1930 3 Sheets-Sheet 2 Feb. 23, 1932. J, RQDE ET AL 1,846,439

METAL WORKING mass Filed Dec. 26. 1930 s Sheets-Sheet 3 Patented Feb. 23, 1932 UNITED STATES PATENT OFFICE] FRIEDRICH J. RUDE AND RUDOLPH W. GLASNER, OF CHICAGO, ILLINOIS METAL W'OIBZKZIZNG PRESS Application filed December 26, 1930. Serial No. 504,985.

This invention relates to improvements in metal working presses in which there is provided a work support or holder and a reciprocable ram which operates upon the a work, the work holder being movable under the stress of the ram, such movement of the work holder being yieldingly resisted by means of a cushioni-ngdevice.

111 machines of this character considerable n difiiculty and inconvenience arises by reason of the fact. that as soon as the ram starts to recede the work will follow the ram, causing in many instances injury to the work as well as other injuries.

it is one of the objects of the present invention to provide improved pneumatic means for automatically and temporarily looking or restraining the work against immediately following the ram when the latter o starts to recede, and improved means responsive in its operation to the operation of, the machine for automatically rendering the looking or restraining-means active and inactive.

To the attainment of these ends and the accomplishment of other new and useful ob jects as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement so of the several parts hereinafter more fully described and claimed and shown in the accompanying drawings illustrating this invention, and in which Figure 1 is a view partly in elevation, part- 35 ly in section, partly broken away and with parts omitted, of a machine of this character, having improvements constructed in accordance with the principles of this invention. applied thereto.

Figure 2 is an enlarged detail sectional View of the cushioning device and the means for temporarily locking or restraining the work and work holder from immediately returning with the ram.

Figure 3 is a view partly in elevation, parttil ly in section and partly broken away, of the controlling mechanism for the locking mechanism.

Figure 4 is a view similar to Figure 3, with the parts in a different position.

Referring more particularly to the drawings the numeral 10 designates a suitable supporting structure upon which the bed 11 is mounted, and rising above the bed 11 are u rights 12 in which a crank 13 is j ournaled.

onnected with the crank shaft are links 14: which support a reciprocable member or ram 15 slidable in guides 16 along the uprights 12.

A second crank shaft 17 is provided with links 18 which are connected with a reoiprocable member 19 that carries a die or forming member 20 and connected with the ram 15 and encompassing the forming member 20 is a work holding member 21, which latter co-operates with a work holder 22 supported by abed plate 23 which rests upon the bed 11.

A die or member 24 is arranged within the work holding member 22 and this member 24 co-operates with the member 20 and is supported by means of pins 25 passing loosely through the bed plate 23. a

All of be above referred to parts are of the ordinary and well known construction of double acting presses and while the present invention is shown as applied to a dou- 7 ble action press, it is to be understood that the same may with equal efliciency be applied to a single action press.

The bed 11 is hollow and is open at the top, the opening being closed by means of the bed plate 23.

In the form of theinvention shown in the drawings there is provided a horizontal partition 26 forming a chamber 27 which is closed, and a chamber 28 which latter is open and is closed by the bed plate 23.

If desired a partition 29 may be provided to divide the chamber 27 into separate compartments which have communication with each other as at 30.

Supported by the partition 26 and extending therethrough, and open at both ends thereof, arecylinders 31 which terminate short of the bottom of the chambers 27. These cylinders 31 extend through the partition 26 and the tops of the cylinders termi pipes 35 and in the pipes 35 are arranged automatic pressure control valves 36 and pressure gages 37, check valves 38 being also;

provided in the pipes. Fluid under any des1red pressure is supplied to the chambers 27 to act upon the pistons 32, causing the pistons to return to theirnormal positions when the ram ascends and when the ram descends the fluid pressure in the chambers 27 against which the pistons 32 act yieldingly resists the movement of the pressure pads 13 under the stress of the ram. The pressure against which the pressure pads operate may be controlled or varied by the adjustment of the pressure regulating valves 36.

The fluid pressure such as air is admitted to the chambers 27 from a supply pipe 39 leading from a suitable source and which pipe 39 is connected with the pipes 35.

In order to hold the pressure pads 33 against return movement after they have been depressed under the stress of the ram and for temporarily locking the pads in such a position and-thereby prevent the work and member 24 from immediately returning with the ram, pneumatic'locking means are provided which consist of cylinders 40, any number of which may be provided, one for each of the pistons 32, arran ed beneath and supported by the bottom of the chambers 27. These cylinders 40 are open at the bottom and the tops are closed by the bottoms of the chambers 27 Piston rods 41 are connected with the respective pistons 32 and pass through the bottom of the chambers 27 and are provided with suitable packin 42 to form fluid tight joints. The ends 0 the pistons 41 extend into the respective cylinders 40 and connected with the pistons and reciprocable in the cylinders 40 are pistons 43 having washers or packing elements 44 secured thereto.

Each of the cylinders 40 is provided with an opening 45 with which a pipe 46 communicates and through which pipes 46 air will be discharged into the cylinders 40 above the respective pistons 43 and through whichone wall of the passage 48, is a passage 49' leading to a chamber 50 which has communication with a discharge outlet pipe 51. Also in the casing 47 is a chamber 52 with which a branch 39 of the pipe 39 has communication, and this chamber 52 has communication through an opening 53in the wall of the passage 48, with the passage 48.

A valve 54 is provided for controllin the passage 49, and a valve 55 is provide for controlling the passage 53.

These valves are respectivelyprovided with stems 5657 and the extremities of the stem project through and'beyond the valve casing wall, collars being provided on the stems, against which springs 58 abut.

The supply of air is admitted through the pipe 39, branch pipes 39, through the respective valve casings 47 into the respective pipes 46 when the valves 54 are seated to close the openings 49 and the valves 55 unseated to per mitthe air flowin into the chamber 48 from the pipe 39 (see igure 3), to flow through the opening 43 into the passage 48 and thence through the pipes 46 on the upper sides of the pistons 43 in the cylinders 40. This will hold the pistons 43 against return movement and thereby lock or hold the pressure pads 33 down and against return movement until the air on the-top side of the pistons 43 is exhausted. When the pistons 43 are thus held againstreturn movement the air pressure in the cylinder 40 on the top side of the piston 43. will overcome the fluid pressure in the chambers 27. w When, however, the valve 55 .(see Figure 4) is closed and the valve 54 is opened the air which has been delivered into the cylinders. 40 on top of the pistons 43 will, as soon as the pistons 43 rise, be forced out of the cylinders 40 through the pipes 46 into the passage 48, through the port or passage 49, into the chamber 50, and out of the discharge pipe 51 to the atmosphere.

The return movement of the pistons 43 when the air pressure on top of the cylinders 43 is relieved, will be caused by the fluid pressure in the chambers 27 acting upon the pistons 32. v

It will therefore be manifest that in order to automatically'control the locking and unlocking effected by the air pressure in the cylinders it is only necessary to control the operation 0 the valves 54 and 55.

This may be effected in any desired or suitable manner, but preferably from a movable part of the press and embodies a rotatable member 56 having adjustable cam devices 57 secured to the periphery thereof, and which member 56 is rotatable in any desired or suitable manner, such as by means of a sprocket chain 58 passing over a sprocket wheel 59 secured to the shaft 60, to which the member 56 is secured.

A member 61 is pivotally mounted intermediate its ends as at 62 beneath the periphery of the member 56, and anti-friction rollers 63 may be provided on the member 56 with which the cams 57 engage. The member 61 is provided with an arm 64 having an anti-friction roller 65 with which a spring pressed member 66 co-operates, and which member 66 not only assists in rocking the member 61, but also serves as a means for maintaining this member 61 in its adjusted position. i

Projections 67 may be provided on the member 61 to engage the ends of the valve stems 56-57.

The member 61 is so arranged that as the member 56 rotates the cams 57 will engage the anti-friction rollers 63 and rock the members 61 in one direction orthe other, causing the respective projections 67 to engage the ends of the respective valve stems 56-57 and depress the latter to open the respective passage controlled by the valve. When one of the valves 5455 is open the other will be closed by means of the spring 58 and as the anti-friction roller 65 passes over the spring controlled member 66 it will act upon the member 61 to assist in rocking it and hold the member 61 in its adjusted position.

The rocking of the member 61 is controlled by the cams 67 which may be so mounted that they may be adjusted to any desired position about the periphery of the member 56.

The specific valve operating mechanism and the specific valve controlled mechanism forms no part of the present invention, but is described in detail in order that a clear understanding of the operation of the mechanism may be had, and for the purpose of showing one form of mechanism for controlling the delivery of the air into the chamber 40, above the piston 43 and to relieve the air pressures above the piston 43.

lit is thought the operation of this device will be clearly understood from the foregoing, but briefly stated it is as follows.

"When the ram is at the limit of its upward movement and the pressure pads 33 are in their normal positions the pads will be held in this position by the pressure in the chambers 27, at which time air is exhausted from the cylinders 40 above the pistons 43. As the ram descends to operate upon the work,

the pressure pads 33 will be lowered against the yielding resistance pressure in the chambers 27. This will lower the pistons 54 in the chamber 40.

At a predetermined time in the cycle of operation of the machine air pressure will be admitted into the cylinders40 above the pistons 43, and this airpressure willbe suflicient to-overcome the pressure inthe chambers 27 which act upon the pistons 32 to return the latter, and the pressure pads 33 will then be locked against return movement.

As the ram 15 1'ecedes,'and at a predetermined. time in the cycle'of operation of the press controlled by the operation of the valves 54 and 55, the pressure in'the cylinders 40 above the pistons 43 will be relieved so as to allow the pressure in the chambers'27 to. act upon the pistons 32 and return the pressure pads3 3 to their normal positions.

While thepreferred form of the invention without departing from thespirit ofthisin- I vention. I

'What is claimed as newis:

1. In a metal working press, awork holder, a fluid pressure cushioning device for yieldingly resisting the movement of a movable part of the press in one direction, a'separate l cylinder open to the atmosphere at one end, a piston movable in said separate cylinder, an operative connection between said piston and said work holder, and means for supplying air to the cylinder between the closed end of the cylinder and the piston for locking the work holder against returnmovement and for exhausting said air from said cylinder.

2. In a metal working press, a work holder, a fluid pressure cushioning device for yieldingly resisting the movement of a movable part of the press in one direction, a separate cylinder open to the atmosphere at one end, a piston movable in said separate cylinder, an operative connection between said piston and said work holder, and means responsive in its operation to a movable part of the press for controlling a supply of air to and the exhausting of the air from said cylinder between the closed end of the cylinder and the piston.

3. A press comprising a movable work support, a cushion for yleldingly resisting the movement of said support in one direction,

said cushion comprising two cylinders, a pisthe openended cylinder between the piston therein and the closed end thereof to overcome the pressure in the other cylinder.

4. A press comprising a movable work support, a cushion for yieldingly resisting the movement of said support-in one direction, said cushion comprising two cylinders, a piston movable in each of the cylinders, an operative connection between the pistons, one of the cylinders being open to atmosphere, and means for introducin a fluid pressure in the open ended cylindcr between the piston therein and the closed end thereof to overcome the pressure in the other cylinder, one of said cylinders forming an integral part of the press.

5. A press comprising a movable work support, a cushion for yieldingly resisting themovement of the support in one direction, said cushion comprising two cylinders, a piston movable in each of the cylinders, an operative connection betweenthe pistons, one' of the cylinders being open at one end to the atmosphere, a common source of supplyof fluid for both of the cylinders, and means for controlling the supply of fluid to the open ended cylinder between the closed end thereof and the piston therein for locking said work holder against return, and for also controlling the exhausting of the fluid from the last said cylinder.

6. A press comprising a movable work support, a cushion for yieldingly resisting the movement of the support in one direction, said cushion comprising two cylinders, pistons individual to the cylinders, an operative connection between the pistons, one of the cylinders being open at one end to atmosphere, a common source of supply of fluid to the cylinders, and means for controlling the supply of fluid to the open ended c linder between the closed end thereof and t e piston therein, whereby the fluid pressure in one of the cylinders-will overcome the fluid pressure in the other cylinder.

7. A. press comprising a movable work support, a cushion for yieldingly resisting the movement of the support in one direction, said cushion comprisin two cylinders, pistons individual to the cyllnders, an operative connection between the pistons, one of the cylinders being open at one end to the atmosphere, a common source of supply of fluid to the cylinders, and means responsive in its operation to a movable part of the press for controlling the supply of fluid to the open ended cylinder between the closed end thereof and the piston therein, whereby the fluid pressure in one of the cylinders will overcome the fluid ressure in the other cylinder.

8. X press comprising a movable work support, acushion for yieldingly resisting the movement of the support in one direction, said cushion comprising two cylinders, pistons individual to the cylinders, an o erative connection between the pistons, one o the cylinders being open at one end to the atmos 

